.layui-container{}

.baner{ background-color: coral; float:right; margin:0px 0 0 0 ;}

.top { height: 150px; }
.top h1 { font-size: 40px; line-height: 150px; font-weight: bold; text-align: center; }

.mid {width: 100%; height: 4500px; }

.mid form{width: 50%; text-align: center; }

.mid form input { width: 100%; margin: 70px auto 0px auto ; height: 50px; font-weight: bold;font-size: 25px; }

.mid form input[type=submit]{width: 200px;}

.mid form span:nth-of-type(1){display: block;margin:0 0 0 0 ; position:absolute; border:1px solid red;}